Once you figure out why your cell phone gets better and cheaper every year but your public schools get more expensive and less effective, you can apply that model to answer a great many questions about public policy.

And he closes with this:

And to the kids camped out down on Wall Street: Look at the phone in your hand. Look at the rat-infested subway. Visit the Apple Store on Fifth Avenue, then visit a housing project in the South Bronx. Which world do you want to live in?